Furnace-chargina device



J. W. DOUGHERTY.

FURNAGE GHARGING DEVICE.

APPLIGATION FILED SEPT. 3, 1910.

11,024,623. l Patented 11111.30, 1912.I 3 SHEETS-SHEET 1. L' ENe J. W. DOUGHERTY.

FURNAGB CHARGING DEVICE.

APPLICATION FILED sums, 191.0.

Patented Apr. 30, 1912.

3 SHEETS-SHEET 2.

J. W. DOUGHBRTY.

FURNAGE GHARGING DEVICE.

APPLICATION FILED SEPT. s, 1910.

Patented A111130, 1912.

3 SHEETS-SHEET 3.

[lll/lll lll/111 mi Illia/11111 a oo marked thereon,

JOHN w. DOUGHERTY, or sTEELToN, PENNSYLVANIA.

FURNACE-CHARGING- DEVICE.

Specification of Letters Patent. Application file-d September 3, 1910.

.PatenteaApr- 30,1912. Serial N0. 580,463.

To allA whom it may concern:

State of Pennsylvania, have invented certain new and useful Improvementsin Fur-' nace-Charging Devices; declare the following to exact description of the will'enable others skilled and I do. hereby be a full, clear, ,and invention, such as inthe art to which itappertains to make and use the same, reference being had to .the accompanying drawings,"and to vletters or figures of reference which form a part of this specification. l

My invention relates to the reduction of oresin shaft furnaces, and more particularly to the reduction" of such ores, specilicallyiron ores, that are accompanied with much es, and my invention consists in feeding the flue dust, or it -may be the fine ore itself, into the-blastor reduction furnace during its operation, below the stock line but above the Crucible. v

Heretofore the liue dust or fines have been introduced into the blast furnace at or above the stock line, or into the crucible thereof, with' the blast. In both of these methods of operation there are serious objections; in the lirst of them it is difficult/to retain the fines at the stock line, they being almost immediately blown out again, and inthe second the introduction of ore into the molten bath, slag or metal, impairs the quality of the metal heat from themolten bath and by imperfect reduction of the ore or flue dust introduced.

By my invention I introduce the'f'lue dust v 0r lines below the stock lineat points where the fine ore will be held in the furnace by a certain thickness of the charge above the point of introduction, and preferably the introduction takes place at a point of the furnace where there .is suiiicient heat to sinter the line mass as soon as it is introduced, thereby converting the dust orvlines at once into a state or physical condition in which they cannot be blown out.

Referring to the accompanying drawings, wherein like parts are similarlyl designated-Figure 1 is an elevation of a blast furnace, partly in section, wherein the fines or Hue dust are fed into the furnace; Fig. 2 is an elevation of a portion of the furnace at right angles to Fig. 1; Fig. 3 .is a plan view; Figs. 4 and 5 are detail sectional Be it known that I, JOHN W. DOUGERTX, a citizen of the United States, residing at- Steelton, in the county of Dauphin and dust and gas will down-comer with produced, by abstracting too much tacle 14 for views of two 'forms of mechanism# for forcing in charges'of flue clust or fines, the first being intermittent in its action and the second continuous in its action.

As the most trouble is experienced in the reduction of fine iron ores, lsuch as Mesaba ores, I have shown my invention in connection with a blast furnace A having a suitable furnace charging mechanism, indicated at B, supplied by a skip hoist C, or otherwise. Above the furnace A or on top of it, and abovethe furnace charging apparatus I placethe flue dust collector 2, having a. conical bottom 3.

2 and extends, preferably, but not -necesl sarily, centrallyinto the same some distance below the top of the collector, as shown in Fig. l. The gas emanating from the charge in the furnace A .enters a pipe or pipesv 5, four such being shown in the'drawings, and passes through the discharge portions of pipes 5, shown as branch pipes 6 to discharge tangentially into the collector near the top of the dustcollector and above the entrance to the down-comer 4, softhat the the dust is more effectually separated from the gas, so that the gas will pass to the comparatively little dust. The pipes 5 varel provided-at their top with bleeder valves 7 mounted on levers 8 provided with adjustable counter-weights 9.-

Connected to the dust collector 2 at or near the bottom thereof, at preferablydiametrically opposite points, are flue dust dellvery pipes,L-1O and 1l, that extend in a spiral line downward 'and about halfway around the furnace, and discharge by inclined ends 12 and 13 into a bin or recepstoring an excess .of the Hue dust. The pitch or incline fof'the spiral portions of the pipes 10 and 11 is sulicient to cause the dust to travel therethrough by gravity. Descending from the spiral portion of the pipes 10 and 11 are substantially vertical supply pipes or pockets 15 that supply the dust to vthe charging devices -18 or 18, Fig. 4 or 5. Ifl the charging device Fig. 4 is used, the flue dust drops from pipe 15 in front ofthe 'plunger 19 into pipe 20 to which the pipe 15 is connected at its lower end. The plunger is provided with a rod 21 onthe end of which is a piston 22 operating in an'air The down-comer 4 for the gas enters the top ,of the dust collector p have imparted to them av `centrifugal movement, by means of which cylinder 23. This cyl?l 65 iron contained in it to become re-oxidized,

. inder is supplied-with motive fluid from a' thereby saving the heat that under other suitable conduit by a pipe 24 through an conditions would be required to reduce t-he automatic steam or air valve 27, of any well dust that would have become re-oxidized. known type. The pipe 20 'is in alinement Should the dust catcher become filled with p I with a passage 25 through the walls of the dust for any reason, and prevent the gas 70 furnace A. A bracket 26 secured tothe from passing through it and the dowincasing a of the furnace supports the mechv comer 4, the bell-bleeder valves 7 will autoanism. matically release the gas coming off from The action of the mechanism shown in the top of the furnace.

[10 Fig. 4 is intermittent, the piston 22 actuatl claim- 75 ing the plunger 19 to and fro to push the 1. The combination with a reducing furdust that has fallen in front'of it into pipe nace; of a dust collector mounted above the 20 and passage 25, so that small portions or furnace, means to Adeliver flue dust from charges of dust are pushed onebehind the said furnace tangentially into said collector,

other until they enter the furnace. beldw the pipesconnected at the bottom of the collec- 80 stock line or at the reducing zone, where tor into which said collector discharges by `they either are held by the mass of the furgravity,` and means to force charges of fluenace charge above, or at once become codust into the furnace below its stock line hered sufficiently to be able to be sustained 4and supplied withdust fromsai'd pipes. i

in the'furnace under all conditions of oper- 2. The combination with a reducing fur- 85 ation of the furnace. The stroke 'of the `nace ;k of a dust collector, means to discharge piston and plunger is'suchthat the plunger the dust therefrom 'in a continuous stream, will never have movement in excess of its pockets to entrap the dust from said stream, length, as otherwise the dust in pipe 15 means to force the dust entrapped in said would fall .behind the piston and either pre- `pockets during its travel into the furnace, 90 vent its operation or force the head of the and means to receive any flue-dust in excess plunger casing off. To effectually prevent of the capacity of said pockets. this the plunger cylinder may be provided 3. The combination with a furnace; of a with an opening 33 through which any dust dust collector above the furnace, a pipe into accidentally accumulating behind the plunwhich the dust collector discharges dust and 95 ger will be discharged, although I have not having a spiral portion intermediate its ound this to befahsolutely necessary if the ends, a receptacle at the end of the pipe, parts are well fitted. means to force charges of dust into the fur- In Fig. 5 the screw conveyer 28 replaces nace and supplied from said spiral portion the plunger of Fig.j4, and this conveyer cxas the dust descends by gravity through said 10 tends beneath the discharge end of the iiuepipe to the receptacle. dust supply pipe 15,into pipe 20. The shaft 4. The combination with a reducing fur- 29 of the screw is provided with a bevel nace; of a dust collector above the top of gear wheel 30 actuated by a similar bevel the furnace, means to discharge dust there- 40 gear wheel 81 on a continuously driven shaft from by gravity continuously, pockets to 105 32. The operation of thismodifled form of entrap the dust during its discharge, means flue-dust charging device is continuous, as to continuously force the dust collected in the screw 28 which is continuously rotated said pockets into the furnace, and means to from shaft 32 will constantly deliver or collect and store any dust in excess of that force the flue-dust, delivered to it from pipe entrapped by the pocket. 110 15, through the passage 25. The flue-dust, The combination with a reducing furcaught in the'dust catcher 2 descends by nace; of a dust collector mounted above the gravity through the spiral pipes 10 and 11 same and having a conical bottom, a downand falls into t-he supply pipes 15, which act comer having its entrance centrally within as pockets to retain or trap quantities of arid below the top of the collector, a plu- 115 the flue-dust and supply it to the charging rality of pipes extending from above the devices 18 or 18a. In case the charging destock line of the furnace and discharging vices cannot get rid of the flue-dust fast tangentially into the collector and above enough as it descends through pipes 10 and the entrance to the down-comer, two pipes 11, as when an excess of dust is produced connected to the dust collector at its bottom 12 by a slip in the furnace charge, then the exand into which the dust is discharged' by cess will pass-bylway of iipes 12 and 13 to gravity, said pipes having spiral portions the storage'receptacle, irom which it is extending substantially half way around taken and char-ged into the furnace in the the furnace, a receptacle into which bothregular way through the hopper, or it may of said pipes discharge, short substantially 125 be charged into the dust catcher through a vertical pipes forming pockets connect/ed to suitable door therein. The flue-dust caught said spiral portions and means to force the in the dust collector 2 is returned to the furdust entrapped in said pockets into the furnace again without allowing the reduced nace.

6. The combination with a reducing fur- 18 forcing nace and charging means therefor; of a dust collector supported above the charging means, a pipe connecting the furnace at a point above the .stock line with the collector, a bleeder valve on said pipe, a distributer pipe extending from the bottom portion of the collector to receive flue dust from the collector, a plurality of mechanisms -for flue dust. into the furnace below its stock line, said mechanisms successively supplied with flue dust by said distributer pipe.

7. The combination with a reducing furnace and a plurality of mechanical means arranged around the furnace to force Hue dustA into the furnace below the stock line thereof; of means to continuously and automatically conduct the flue dust in a plurality of helical paths on opposite sides of the furnace to said forcing means, said conducting means arranged `to maintain the fiue dust in the forcing means solely under the direct pneumatic pressure of the furnace gases under,b all conditions of operation.

8. The combination with a reducing furnace and a plurality of mechanical means arranged around the furnace to force the flue dust into it below the stock line thereof; of means to continuously and automatically discharge the flue dust by gravity at different levels to said forcing means while maintainingtlie dust in said means solely under the pneumatic pressure of the fur1- nace gases, and means below any of the forcing means to collect any flue dustfpassing said forcing means and also under the pressure of the furnace gases.

9. The combination with a reducing furnace, of means into which said furnace discharges fiue dust from the furnace gases, means to automatically. and continuously discharge the Hue dust therefrom by gravity, flue dust during its discharge from the first mentioned means, and mechanism to positively introduce said separate volumes separately intothe furnace below the stock line therein.

l0. The combination with a reducing furnace, of means into which said furnace discharges flue dust from the furnace gases, means to automatically and continuously discharge the flue dust therefrom by gravity, means to entrap separate volumes of fiue dust during its discharge from the first mentioned means, mechanism tov positively introduce said separate volumes separately into the furnace below the stock line therein, and means to collect any iue dust in excess of the entrapped separate volumes.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

JOHN l/V. DOUGHERTY.

lVitnessesi HOMER LrrznNBERG.,` CHAs. B. SNYDER.

means to entrap separate volumes of 

